Hi Christine and welcome! Sorry to hear you almost certainly have GCA but the big positive is you had doctors who took it seriously and did something.
It would help us if you told us what you mean by "6 tablets a day" - I assume you mean 6 tablets of 5mg each, a total dose of 30mg a day. Doubling it to 60mg would be quite normal for GCA, it needs a very high dose to avoid it affecting your sight and sometimes they give even more, even up to 100mg but then they usually give it by a drip into a vein.
As for telling you to take aspirin "for the pain" - I'm horrified at that but I suspect he has got some facts mixed up. You should NOT take any of the pain-killers called NSAIDs when you are taking prednisolone: both of them can cause stomach irritation and lead to bleeding, take both and the risk is increased greatly. If you need pain relief - yes, take paracetamol but still only the recommended dose and preferably never with alcohol, each of them are bad for your liver. That said - it is the dose pf pred which will stop the pain as it reduces the inflammation. The inflammation causes swelling which makes it more difficult for the blood to flow through the artery so tissues don't get enough oxygen - think of a hosepipe that is being stood on, the water can't get through to water the plants.
It is recommended that patients who have GCA should take a low dose aspirin per day - just like they tell you to if you have had or at risk of a stroke or heart attack - and it is to make your blood less "sticky". I'd like to think he mixed up that with using aspirin as a pain killer. I also hope you GP knows about taking a low dose aspirin with GCA.
I hope you are taking the pred tablets all together in one go, first thing in the morning, as early as possible. Never take it on an empty stomach, in the middle of your breakfast is ideal but quite a few of us find a good live yoghurt is also enough - you can leave that by the side of your bed with a glass of water, take it as soon as you wake up with the yog and that allows it to get into your system before the day starts. If you happen to wake up very early - so much the better, and having the yog and water by the bed means you can get on with it without having to get up and then cuddle down for a bit more kip! You need to take the tablets all at one go to get the blood level high enough to really attack the inflammation.
I think the reason the hospital doc told you to get your bloods done again was to see if it had risen any further - "it" being a test called the ESR or another is called "CRP". The ESR measures how fast the red blood cells sink to the bottom when blood is put in a tube and it is set up on end - like the snow settles in those globe things with a scene and water in them. It depends on the proteins in the blood - they change when there is inflammation in the body and the red blood cells sink to the bottom much more quickly. CRP is a direct measure of some of the proteins - it also goes up in most cases of GCA and can reach VERY high levels. If it does it can be used to see if the treatment is working - it doesn't in a few people and then all there is to go by is the improvement in the symptoms, but they are the most important guide anyway.
I think that's enough info for now - but come back and ask any questions you have and we'll try to answer them. MrsO will be around later too, she has had GCA though it took then a very long time to realise it. You say you feel as if you have been left - most GPs have never seen a case of GCA, it is a quite rare illness, and they also tend not to realise a) how scary it can be and b) that you DON'T immediately feel back to normal when they give you pred. Apart from anything else the high doses of pred can make you feel quite bizarre - but it will save your sight!
If you follow this link:
https://patient.info/forums/discuss/pmr-gca-and-other-website-addresses-35316
you will find links to some other sites where you will find a lot more info than is obvious here. The PMR and GCA U northeast support site in particular has articles and stories from doctors and patients which are all checked for accuracy - no internet wibble there! The other forum also has loads of people (some fro here too) who have already been there, done that and got the t-shirt.
Where do you live? There are support groups with real life people in various places all over the UK and there may be one near you if you live in the UK.
all the best for now
Eileen